sandgardenhq/scale-game

Scale Game

Overview

Test your approach at extreme scales to find what breaks and what surprisingly survives.

Core principle: Extremes expose fundamental truths hidden at normal scales.

Quick Reference

| Scale Dimension | Test At Extremes | What It Reveals | |-----------------|------------------|-----------------| | Volume | 1 item vs 1B items | Algorithmic complexity limits | | Speed | Instant vs 1 year | Async requirements, caching needs | | Users | 1 user vs 1B users | Concurrency issues, resource limits | | Duration | Milliseconds vs years | Memory leaks, state growth | | Failure rate | Never fails vs always fails | Error handling adequacy |

Process

1. Pick dimension - What could vary extremely?
2. Test minimum - What if this was 1000x smaller/faster/fewer?
3. Test maximum - What if this was 1000x bigger/slower/more?
4. Note what breaks - Where do limits appear?
5. Note what survives - What's fundamentally sound?

Examples

Example 1: Error Handling

Normal scale: "Handle errors when they occur" works fine At 1B scale: Error volume overwhelms logging, crashes system Reveals: Need to make errors impossible (type systems) or expect them (chaos engineering)

Example 2: Synchronous APIs

Normal scale: Direct function calls work At global scale: Network latency makes synchronous calls unusable Reveals: Async/messaging becomes survival requirement, not optimization

Example 3: In-Memory State

Normal duration: Works for hours/days At years: Memory grows unbounded, eventual crash Reveals: Need persistence or periodic cleanup, can't rely on memory

Red Flags You Need This

• "It works in dev" (but will it work in production?)
• No idea where limits are
• "Should scale fine" (without testing)
• Surprised by production behavior

Remember

• Extremes reveal fundamentals
• What works at one scale fails at another
• Test both directions (bigger AND smaller)
• Use insights to validate architecture early